Actuating means for throttle-valves of carbureters



C. L. SHEPPY.

ACTUATING MEANS FOR THROTTLE VALVES 0F CARBURE-TERS.

APPLICATION FILED 050.29. 1919.

1,397,987. Patented Nov. 22, 1921.

A 7 7' OR/VE Y5.

. showing the UNITED STATES PATENT OFFICE.

CHARLES L. SHEPPY, OF BUFFALO, NEW YORK,

ASSIGNOR TO THE PIERCE ARROW- MOTOR CAR COMPANY, OF BUFFALO, NEW YORK.

Application filed December 29, 1919.

To all whom z'tmay concern:

Be it known that I, CHARLES L. SHEPPY, citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented a new and useful Improvement in Actuating Means forThrottle-Valves of Carburetors, of which the following is aspecification.

In carbureters which are provided with a throttle valve of the usualbutterfly type, trouble is experienced in opening the valve slowlyenough during the first part of the travel of the valve. The volume offluid permitted to pass the throttle valve should increase slowlyatfirst and more rapidly as the opening movement of the valve continues,but it is very difficult, if not practically impossible, to obtain sucha movement with the throttle valve operating mechanisms ordinarilyemployed.

One object of this invention is to provide ardesirable and practicaloperating mechanism for the throttle valves of carburetors, whereby,with the ordinary actuation or movement of the usual operating device orlever, the valve is caused to'open with a motion which is slow duringthe first portion of its movement and increases gradually as themovement continues, until at the last port-ion of the movement thetravel of the valve is relatively much more rapid.

Another object of the invention is to improve valve ope-ratingmechanisms for carbureters in the other respects herein described andset forth in the claims. In the accompanying drawings Figure 1 is a sideelevation of a 'carbureter provided with a throttle valve operatingmechanism embodying the invention.

Fig. 2 is a fragmentary similar view on an enlarged scale, showing theposition of the parts when thevalve is closed.

Fig. 3 is a similar view showing the position of the parts when thevalve is wide open.

Fig. 4 is a fragmentary plan view thereof position-of the parts when thevalve is closed.

A represents a carbureter, which may be of any usual or suitableconstruction, and B the chamber or passage thereof in which the throttlevalve is arranged to'control the flow of the explosive mixture to theengine with which the carbureter is connected. C represents the throttlevalve, which is of the usual Specification of Letters Patent.

Patented Nov. 22, 1921. Serial No. 347,940.

butterfly type, consisting .of a disk pivoted in the passage B so as toswing to close or open the passage. 0 is the stem or pivot shaft of thethrottle valve. This stem extends out through ahole in the wall of thevalve chamber or passage. Ordinarily, in motor vehicles, this valve stemis provided with an arm connected by a rod to the valveoperating leveror device on the steering post of the vehicle so that the valve isopened or closed by swinging this lever in one direction or the other. i

10 represents an actuating lever, cam or device which is adapted to moveindependently of or differentially relative to the valve shaft and ispreferably pivoted to swing about an axis at one side of or at adistance from the throttle valve shaft. The lever 10 is shown as looselypivoted on a fixed stud 11 projecting from the side of the carbureterand is retained on the stud by a collar 12, secured by a cotter pin 13on the outer end of the stud. An-arm 14 is fixed in any suitablemannerj, for instance by a cross pin or key 15, to the outer end orportion of the throttle valve stem 0. This arm is preferably providedwith an adjustable screw or member 16 which rests or bears against oneedge or face 16" ofthe lever 10. 17 indicates a lock nut for theadjusting screw 16. The screw or adjusting device 16 is held inengagement with the lever or cam 10 by a suitable spring 18 which actsto close the throttle valve. This spring preferably consists of a springwire coiled about the bearing for the throttle valve stem, with one endhooked on a fixed stop or projection 19 on the carbureter and the otherend hooked on the arm 14.

\Vhen the lever or cam 10 is swung in one direction, for instance to theright in the drawings, its edge 16, which is eccentric to the leverpivot, acts as a cam against the screw 16 and swings the arm 14, thusopening the throttle valve.- When the lever or cam 10 is swung in theopposite direction the spring 18 causes the arm 14.- to follow the leveror cam and thus close the throttle valve. In the position of the partsshown in Fig. 2, when the throttle valve is closed, the screw 16 on thearm 14 of the throttle valve bears against the lever or cam 10 close tothe lever pivot, and as the lever swings, the screw slides along the camedge 16 of the lever or contacts therewith at a successively or plateinitial position adj usting increasing distance from the axis of thelever or cam. The opening movement of the throttle valve, therefore,will be slow at first and will gradually increase as the movement of thelever or cam 10 continues. In this way the area of the opening made bythe movement of thethrottle valve enlarges or increases. in area slowlyat first and more rapidl as the opening movement continues. The e ge orface l6 of the lever or cam 10 on which the screw '16 bears can beeither straight, concaved or convex, or of other formation, as may benecessary to give the desired varying or increasing motion of-thethrottle valve. This edge'or face of the lever or cam and also theadjusting screw or member 16 are preferably hardened to reduce the wearthereon, and the bearing end of the screw is preferably rounded as Byadjusting this screw 16, the of the throttle valve in the closedposition of the operating mechanism can be regulated as desired.

Preferably, the arm 14 of the throttle valve is provided with a stop lug0r projection 20 adapted to strike the-stop 19 on the carbureter, orother suitable stop, to arrest the movement of the throttle valve whenit has reached its wide open position.v

21 indicates an operating rod which is pivshown.

' oted or connected in any suitable manner to 4 relatively inga -n theactuating leve'r or cam 10. This operat ing rod, which in ordinaryconstructions is connected to the arm on the throttle valve stem,extends to the operating lever or de vice on the steering post or footaccelerator for transmitting the movement therefrom for opening andclosing the throttle valve.

I claim as my invention:

1. The combination with acarbureter having a pivoted throttle valve, ofa separate actuating device therefor which is movable to the throttlevalve, and operative connections between said actuating device andthe'throttle valve constructed to produce a varying rate of motion ofthe throttle valve which increases as the opening movement of theactuating device continues.

2. The combination with a carbureter havivoted throttle valve, and anarm conmovable relatively to the actuating device throttle valve andhaving a-face engaging a atter,

part on said arm for swinging the said face being shaped to produce a.va ing rate of motion of the throttle valve w 'ch increases as theopening movement of the actuating device continues. j

3. The combination with a carbureter having a pivoted throttle valve,and an arm connected to said throttle valve, of a separate actuatinglever pivoted to move relatively to the throttle valye and having a faceengaging 9. art on said am for swmging the arm, sai face being shaped toproto said throttle valve, of a separatefirate actuating lever .forswinging duce a varying rate of motion of the throttle valve whichincreases as the opening movement of the lever continues.

4. The combination with .a carbureter having a pivoted throttle valve,and an arm connected to said throttle valve, of an actuating leverpivoted to swing about an axis distant from the pivotal axis of thethrottle valve and having a face engaging a part on said arm forswinging the arm, said face being shaped to produce a varying rate ofmotion of the throttle valve which increases as the opening movement ofthe lever continues.

5. The combination with a carbureter having a pivoted throttle valve,and an arm connected to said throttle valve, of an actuating levertherefor pivoted on an'axis parallel to the pivotal axis of saidthrottle valve, said lever having a face engaging a part on said arm forswinging the arm, whereby opening movement of said lever results in agradually accelerating opening movement of said throttle valve.

' 6. The combination with a carbureter having a pivoted throttle valve,of an actuating lever therefor pivoted to swing about an axis distantfrom the pivotal axis of the throttle valve, an arm fixed to'saidthrottle valve, and a spring which tends to" close the throttle valveand holds a part of said arm in sliding contact with a face on saidlever eccentric to the pivotal axis of the lever whereby when the leveris swung it produces a varying rate of motion of the throttle valve.

7. The combination with a carbureter having a pivoted throttle valve, ofa separate actuating lever therefor pivoted to swing relatively to thethrottle valve, an arm fixed to said throttle valve, an adjustablemember on said arm, and a spring which holds said adjustable member insliding contact with a face on said lever eccentric to the pivotal axisof the lever whereby when the lever is sw it produces a varying rate ofmotion of the throttle valve.

8. The combination with a carbureter having a pivoted throttle valve,and an arm connected to said throttle valve, of a sepatherefor pivotedto move the throttle valve and toward said throttle valve, said leverengaging a part on said arm the arm, whereby opening said leverresultsin a gradurelatively to the axis of having a face movement ofally accelerating opening movement of the throttle valve.

Witness my hand this 24th day of Decemher, 1919. 1

. CHARLES L. SHEPPY. 'Witnesse -(J. F. Macorrm,

CHARLES Pnno'rnnnx.

